Systems and methods for communication of channel state information

• US 9,813,135 B2
• Filed: 09/28/2011
• Issued: 11/07/2017
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Abraham, Santosh Paul, Merlin, Simone, Vermani, Sameer, Sampath, Hemanth
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): PATEL, HARDIKKUMAR D
• Application Number:
  US13/247,023
• Publication Number:
  US 20120250618A1
• Time in Patent Office: 2,232 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0636 Feedback format
• CPC Class Codes: H04B 7/0658 Feedback reduction
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/0039 other detection of signalling, e.g. detection of TFCI explicit signalling H04L1/0046, H04L27/0012 and H04L25/0262 take precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system.

Claims

1. A method for wireless communication, comprising:

receiving a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;

determining channel state information based at least in part on a null data packet associated with the null data packet announcement; and

transmitting a message comprising the sequence number identifying the null data packet announcement and at least one parameter of the determined channel state information.

2. The method of claim 1, wherein the at least one parameter comprises a number of columns of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

3. The method of claim 2, wherein the matrix comprises a plurality of Eigen modes, singular vectors, or singular values.

4. The method of claim 1, wherein the at least one parameter comprises a number of rows of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

5. The method of claim 1, wherein at least one parameter comprises a grouping of tones, wherein the transmitted message comprises a field indicating that the determined channel state information was determined for the grouping of tones, and wherein the field comprises at least 2 bits.

6. The method of claim 1, wherein the at least one parameter comprises a bandwidth of the determined channel state information, wherein the transmitted message comprises a field indicating the bandwidth, and wherein the field comprises at least 2 bits.

7. The method of claim 6, wherein the at least 2 bits indicate that the bandwidth is any one of 20 Megahertz, 40 Megahertz, 80 Megahertz, and 160 Megahertz.

8. The method of claim 1, wherein the at least one parameter comprises information for indexing into a table indicating how values of the determined channel state information are quantized, wherein the transmitted message comprises a field including the information, and wherein the field comprises 1 bit.

9. The method of claim 1, wherein the transmission further comprises at least one segment of the determined channel state information.

10. The method of claim 9, wherein the transmitted message further comprises a field indicating a number of segments of the determined channel state information that have not been transmitted.

11. The method of claim 10, wherein the field comprises 3 bits.

12. The method of claim 1, wherein the sequence number is represented by 6 bits.

13. The method of claim 1, wherein the transmitted message further comprises a field including bits that are reserved.

14. The method of claim 1, wherein the transmitted message comprises a control field, the control field comprising the sequence number of the null data packet announcement and the at least one parameter of the determined channel state information.

15. An apparatus for wireless communications, comprising:

a receiver configured to receive a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;

a processing system configured to determine channel state information based at least in part on a null data packet associated with the null data packet announcement; and

a transmitter configured to transmit a message comprising the sequence number identifying the null data packet announcement and at least one parameter of the determined channel state information.

16. The apparatus of claim 15, wherein the at least one parameter comprises a number of columns of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

17. The apparatus of claim 16, wherein the matrix comprises a plurality of Eigen modes, singular vectors, or singular values.

18. The apparatus of claim 15, wherein the at least one parameter comprises a number of rows of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

19. The apparatus of claim 15, wherein the at least one parameter comprises a grouping of tones, wherein the transmitted message comprises a field indicating that the determined channel state information was determined for the grouping of tones, and wherein the field comprises at least 2 bits.

20. The apparatus of claim 15, wherein the at least one parameter comprises a bandwidth of the determined channel state information, wherein the transmitted message comprises a field indicating the bandwidth, and wherein the field comprises at least 2 bits.

21. The apparatus of claim 20, wherein the at least 2 bits indicate that the bandwidth is any one of 20 Megaherz, 40 Megaherz, 80 Megaherz, and 160 Megaherz.

22. The apparatus of claim 15, wherein the at least one parameter comprises information for indexing into a table indicating how values of the determined channel state information are quantized, wherein the transmitted message comprises a field including the information, and wherein the field comprises 1 bit.

23. The apparatus of claim 15, wherein the transmitter is further configured to transmit at least one segment of the determined channel state information.

24. The apparatus of claim 23, wherein the transmitted message further comprises a field indicating a number of segments of the determined channel state information that have not been transmitted.

25. The apparatus of claim 24, wherein the field comprises 3 bits.

26. The apparatus of claim 15, wherein the sequence number is represented by 6 bits.

27. The apparatus of claim 15, wherein the transmitted message further comprises a field including bits that are reserved.

28. The apparatus of claim 15, wherein the transmitted message comprises a control field, the control field comprising the sequence number of the null data packet announcement and the at least one parameter of the determined channel state information.

29. An apparatus for wireless communications, comprising:

means for receiving a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;

means for determining channel state information based at least in part on a null data packet associated with the null data packet announcement; and

means for transmitting a message comprising the sequence number of the null data packet announcement and at least one parameter identifying the determined channel state information.

30. The apparatus of claim 29, wherein the at least one parameter comprises a number of columns of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

31. The apparatus of claim 30, wherein the matrix comprises a plurality of Eigen modes, singular vectors, or singular values.

32. The apparatus of claim 29, wherein the at least one parameter comprises a number of rows of a matrix representative of the determined channel state information, wherein the transmitted message comprises a field indicating the number, and wherein the field comprises at least 3 bits.

33. The apparatus of claim 29, wherein the at least one parameter comprises a grouping of tones, wherein the transmitted message comprises a field indicating that the determined channel state information was determined for the grouping of tones, and wherein the field comprises at least 2 bits.

34. The apparatus of claim 29, wherein the at least one parameter comprises a bandwidth of the determined channel state information, wherein the transmitted message comprises a field indicating the bandwidth, and wherein the field comprises at least 2 bits.

35. The apparatus of claim 34, wherein the at least 2 bits indicate that the bandwidth is any one of 20 Megaherz, 40 Megaherz, 80 Megaherz, and 160 Megaherz.

36. The apparatus of claim 29, wherein the at least one parameter comprises information for indexing into a table indicating how values of the determined channel state information are quantized, wherein the transmitted message comprises a field including the information, and wherein the field comprises 1 bit.

37. The apparatus of claim 29, wherein the transmission further comprises at least one segment of the determined channel state information.

38. The apparatus of claim 37, wherein the transmitted message further comprises a field indicating a number of segments of the determined channel state information that have not been transmitted.

39. The apparatus of claim 38, wherein the field comprises 3 bits.

40. The apparatus of claim 29, wherein the sequence number is represented by 6 bits.

41. The apparatus of claim 29, wherein the transmitted message further comprises a field including bits that are reserved.

42. The apparatus of claim 29, wherein the transmitted message comprises a control field, the control field comprising the sequence number of the null data packet announcement and the at least one parameter of the determined channel state information.

43. A non-transitory computer readable medium comprising instructions that when executed cause an apparatus to:

receive a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;

determine channel state information based at least in part on a null data packet associated with the null data packet announcement; and

transmit a message comprising the sequence number of the null data packet announcement and at least one parameter identifying the determined channel state information.

44. An access terminal, comprising:

at least one antenna;

a receiver configured to receive, via the at least one antenna, a message comprising a null data packet announcement, the null data packet announcement comprising a sequence number identifying the null data packet announcement;

a processing system configured to determine channel state information based at least in part on a null data packet associated with the null data packet announcement; and

a transmitter configured to transmit a message comprising the sequence number of the null data packet announcement and at least one parameter identifying the determined channel state information.